[vbox-dev] USB EHCI support under Windows

Hans Petter Selasky hselasky at c2i.net
Fri Aug 19 08:02:12 PDT 2011

On Friday 22 July 2011 18:06:00 Hans Petter Selasky wrote:
> Hi,
> There appears to be a bug when cancelling USB transactions (removing them
> from the EHCI schedule) on endpoints using the USB 2.0 mode, that the USB
> device is automatically re-enumerated. Who is responsible for this part?
> Is there any support available?


Investigating this issue more properly, I see that VirtualBOX returns an error 
code when the Emulated OS tries to clear the stall on any endpoints. This in 
turn cause the Emulated OS (FreeBSD) to re-enumerate the device.

Is this a bug or feature in VirtualBOX. Shouldn't clear-stall allways succeed, 
even if the data toggle value is not cared about?


Fix for FreeBSD:


More information about the vbox-dev mailing list